121210879 has 4 divisors (see below), whose sum is σ = 122871376. Its totient is φ = 119550384.

The previous prime is 121210829. The next prime is 121210889. The reversal of 121210879 is 978012121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121210879 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 121210879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121210819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 830139 + ... + 830284.

It is an arithmetic number, because the mean of its divisors is an integer number (30717844).

Almost surely, 2^121210879 is an apocalyptic number.

121210879 is a deficient number, since it is larger than the sum of its proper divisors (1660497).

121210879 is an equidigital number, since it uses as much as digits as its factorization.

121210879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1660496.

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 121210879 is about 11009.5812363595. The cubic root of 121210879 is about 494.8959125427.

The spelling of 121210879 in words is "one hundred twenty-one million, two hundred ten thousand, eight hundred seventy-nine".